Causes of Baoji outbreak

The returnees are not isolated. "Baoji, formerly known as Chencang and Yongcheng, is a prefecture-level city under the jurisdiction of Shaanxi Province, a sub-central city of Guanzhong Plain urban agglomeration and a sub-central city of Guantian Economic Zone. After a person came back from Inner Mongolia, he didn't report nucleic acid, and he didn't know it after being infected. He ran around, causing a serious spread of the epidemic. Located in the west of Guanzhong Plain, it governs 4 districts and 8 counties, with a total area of1817 square kilometers and a permanent population of 3.282 million at the end of 2002/kloc-0.